Most homeowners pay between $600 and $4,000 to replace flexible ductwork, with per-run and per-linear-foot pricing driving the final cost. This article shows typical cost ranges, per-unit rates, and the main factors that affect the cost to replace flexible ductwork so buyers can budget and compare quotes quickly.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Single short run (10–20 ft) | $40 | $100 | $250 | Includes materials + 0.5–1.5 hours labor |
| Whole-house (10–25 runs) | $600 | $2,000 | $4,000 | Assumes 1,200–2,500 sq ft home |
| Per linear foot installed | $4/ft | $8/ft | $15/ft | Varies by diameter & access |
| Re-insulating flex ducts | $2/ft | $4/ft | $8/ft | Optional insulation wrap or replacement |
Typical Total Price To Replace Flexible Ductwork In A 1,500–2,500 sq ft Home
Assumptions: suburban U.S., standard 8–10 runs, accessible attic/garage, standard 6–8″ to 10″ flex ducts.
Expect a total project price of $600-$4,000 with an average near $2,000 for a typical mid-size home.
Low-end jobs ($600-$900) replace only a few short runs or repair sequential runs using basic 6″ flex, minimal taping, and no insulation upgrade. Average jobs ($1,200-$2,500) replace 8–12 runs with new flex, transition boots, clamps, and 4–10 hours of labor. High-end jobs ($3,000-$4,000+) include many long runs, larger diameters (10–14″), re-insulation, difficult attic access, and professional sealing systems.
Material, Labor, Equipment And Disposal Line Items
| Materials | Labor | Equipment | Disposal |
|---|---|---|---|
| $3-$10/linear ft flex duct, $6-$25 per boot/transition | $75-$125/hour; typical 1–12 hours | $50-$200 (ladders, shears, lift rental if needed) | $30-$150 depending on debris |
| Insulation $2-$8/ft if replacing wrap | Power tools, duct sealing tools | Bulky disposal charges if major demo |
Materials usually account for 25%–45% of the total; labor and access difficulty often make up the rest.
How Length, Diameter, And Number Of Runs Change The Quote
Per-linear-foot and per-run counts are the clearest cost multipliers: longer runs and larger diameters raise price proportionally.
Examples of variable thresholds: short runs under 20 linear ft cost $4-$8/ft installed; medium runs 20–60 ft cost $6-$10/ft; long runs over 60 ft cost $8-$15/ft due to more labor and support. Diameter matters: 6″–8″ ducts are cheaper, 10″–14″ add $1–4/ft. Each additional register or boot adds $20-$60 for a basic boot and $75-$200 if replacing sheet metal transitions.
Practical Ways To Lower Your Flexible Ductwork Replacement Price
Control scope: replace only damaged sections, keep run lengths short, and avoid unnecessary diameter upsizing.
Other ways to cut cost: schedule work in off-peak seasons, prepare attic or crawlspace for easy access, provide on-site disposal space, and request material-only quotes to compare contractor markups. Choosing standard insulated flex rather than higher-R proprietary products can save $2-$6/ft.
How Labor Time, Crew Size, And Scheduling Affect The Final Bill
Labor time typically ranges from 1–12 hours depending on scope; two-person crews speed work but add hourly labor cost.
Typical durations: a single short run 0.5–1.5 hours; whole-house replacement 6–12 hours. Expect contractor minimums of 2–4 hours and call-out fees of $75-$150. Two technicians reduce project hours by 25%–50% but multiply hourly payroll, so overall savings vary by job.
Real-World Quote Examples With Specs And Totals
| Scenario | Specs | Labor Hours | Price |
|---|---|---|---|
| Small repair | Replace 2 short 6″ runs, new clamps | 1.0 | $85-$180 |
| Typical replacement | 10 runs, 20–40 ft each, mixed 6″–8″ | 8.0 | $1,200-$2,200 |
| Large/complex | 15+ runs, long attic routes, re-insulate | 10–12 | $2,800-$4,200 |
Assumptions: includes materials, standard boots, basic sealing; excludes major sheet metal rebuilds or HVAC system changes.
Add-On Work And Common Extra Charges That Increase The Price
Replacement often uncovers related needs: new boots, collar replacements, leakage sealing, and re-insulation can add $200-$1,200.
Common extras: replacing poor sheet metal takeoffs ($150-$600), adding sound attenuators ($100-$400 each), repairing joists or drywall for access ($200-$1,000), and permit or inspection fees in some municipalities ($50-$300). Expect a diagnostic fee or trip charge of $50-$150 if no work is done on the visit.